Caspase-independent mitotic death (CIMD)

Katsumi Kitagawa, Yohei Niikura

Research output: Contribution to journalReview article

35 Scopus citations

Abstract

The spindle checkpoint, which monitors kinetochore-microtubule attachment, is required for high fidelity of chromosome transmission. A failure in this mechanism causes aneuploidy, thereby promoting progression to tumorigenesis. However, the cell death mechanism that prevents the aneuploidy caused by failure of the spindle checkpoint is yet unknown. We have recently identified a novel type of mitotic cell death, which we term caspase-independent mitotic death (CIMD). In BUB1-deficient (but not MAD2-deficient) cells, CIMD is induced by conditions that activate the spindle checkpoint (i.e., cold shock or treatment with nocodazole, paclitaxel or 17-AAG [17-allylaminogeldanamycin]). CIMD depends on p73, a homolog of p53, but not on p53. It also depends on the apoptosis-inducing factor (AIF) and endonuclease G (Endo G), which are effectors of caspase-independent cell death. When BUB1 is completely depleted, aneuploidy occurs instead of CIMD. We propose that CIMD can be the cell death mechanism that protects cells from aneuploidy by inducing the death of cells prone to substantial chromosome missegregation. Our study also shows that previous evaluations of the spindle checkpoint activity in mutant or cancer cells by monitoring mitotic index could be misleading.

Original languageEnglish (US)
Pages (from-to)1001-1005
Number of pages5
JournalCell Cycle
Volume7
Issue number8
DOIs
StatePublished - Apr 15 2008
Externally publishedYes

Keywords

  • Aneuploidy
  • Bub1
  • Caspase-independent cell death (CIMD)
  • Chromosomal instability
  • Mitosis
  • Spindle checkpoint
  • p73

ASJC Scopus subject areas

  • Molecular Biology
  • Developmental Biology
  • Cell Biology

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